MKIV "high tech" yaw string (tech note)

I recently heard from an owner having installed a MKIV yaw string on a FES (front, electric, self-launch/sustainer) equipped glider. He said that the MKIV was not indicating straight back centered in level flight, being slightly off to the side and deflection in turns was "not even, more sensitive in one direction" (my words).

Since all MKIV yaw strings are carefully obedience trained and calibrated before leaving my shop (g), there had to be something affecting the flow over the canopy. I suspected the culprit might be the folded prop, given the ship's rigging apparently checked fine. I suggested installing temporary yaw strings further back on the canopy to determine how far aft the string would need to be located to behave in an acceptable manner - then mark that spot for the warranty* replacement. I think that worked and all is well (I hope).

If installing a MKIV on a FES equipped glider, please determine suitability of chosen location by test flying with temporary yarn/s prior to installing the MKIV.

MKIV's and Quiet Vents are available on-line at Craggy Aero, Cumulus, and Wings & Wheels!

*For warranty replacement - please contact me directly. IF you read the installation instructions and still goof, that's covered too (once!), warranty coverage is at my sole discretion (but I'm easy).

all the best,

bumper

bumperm at frontier dot
com

Been flying all week in the Electro with a brand new Mark IV. My yaw string must be more obedient than that other guys...its nice and straight all the time

Or maybe an installation error. Perhaps taped at both ends?

Hey! I just installed a MK-4 on my LAK-17a and it seems to fly
straighter than before. Do you think I made that same double tape mistake?

I also installed Bumper's quiet vent mod and am very pleased with the
smoother, quieter air coming in the vent.

On 8/9/2015 2:31 PM, 2KA wrote:
Or maybe an installation error. Perhaps taped at both ends?


--
Dan Marotta

Beat this, I heard of a pilot (!) who drilled a hole in the canopy for the
yaw string!

Doh..

At 04:44 10 August 2015, Dan Marotta wrote:
Hey! I just installed a MK-4 on my LAK-17a and it seems to fly
straighter than before. Do you think I made that same double tape
mistake?

I also installed Bumper's quiet vent mod and am very pleased with the
smoother, quieter air coming in the vent.

On 8/9/2015 2:31 PM, 2KA wrote:
Or maybe an installation error. Perhaps taped at both ends?


--
Dan Marotta

So wait, were do I download the firmware update for the yaw string?

2KA wrote:
Or maybe an installation error. Perhaps taped at both ends?

Well Tony did install it backwards with the pointy but facing back.
Apparently Tony didn't RTFM ;-)

Peter

Has the problem with the yaw string not being coordinated with inputs been addressed? It doesn't stay coordinated with either rudder or aileron inputs. It only works when both are applied somewhat simultaneously. Not beginner friendly at all!

There should be something like a beginner or intermediate setting on every yaw string.

I fitted a turn-o-matic feature to my yaw string. It's water-activated. Just fly fast through rain and hey presto! All your turns for the next 5 minutes become perfectly co-ordinated.

Send no money now, folks!

Sounds like mid winter "cabin fever" here..... but in August (in the northern hemisphere)......

Maybe some need to get a life, or a different job......

----- ;-)

[Picking, not slamming....]